Every buyer asks what the pool costs to run and almost every answer they get is wrong, because it only counts the heating.

Evaporation is the bill

An uncovered heated pool loses more energy overnight to evaporation than it uses being brought up to temperature. A slatted automatic cover cuts that by around seventy per cent.

Pair it with the house system

Running the pool off the same air-source unit that serves the house roughly halves the marginal cost against a dedicated pool heater.

The honest figure

A twelve by four metre pool, covered, heated to twenty-eight degrees and shared with the house system, lands between nine hundred and thirteen hundred a year.